Joint mechanism and child safety seat

Abstract

A joint structure includes: a fixing part, which is connected to a first object, and has a cylindrical fixing part side wall having an open end and a receiving end provided opposite to each other; an inserting part, which is connected to a second object, has a cylindrical inserting part side wall, and is inserted and sleeved into the fixing part side wall along an insertion direction through the open end; a closing member, which is provided inside the fixing part side wall, positioned between the receiving end of the fixing part and the inserting part, movable between the open end and the receiving end, and has a closing plate adjacent to the open end and is shaped corresponding to a cross-sectional shape of the fixing part side wall at the open end; a first elastic member, which exerts a force that biases the closing member toward the open end.

1 . A joint structure for detachably joining a first object to a second object, comprising:
 a fixing part connected to the first object, the fixing part having a cylindrical fixing part side wall, and the fixing part side wall having an open end and a receiving end provided opposite to each other;   an inserting part connected to said second object, the inserting part having a cylindrical inserting part side wall, and the inserting part being inserted and sleeved into the fixing part side wall along an insertion direction through the open end, such that the second object is jointed to the first object;   a closing member provided inside the fixing part side wall, positioned between the receiving end of the fixing part and the inserting part, and being movable between the open end and the receiving end; the closing member having a closing plate adjacent to the open end, and the closing plate being shaped corresponding to a cross-sectional shape of the fixing part side wall at the open end; and   a first elastic member provided between the closing member and the receiving end, for exerting a force that bias the closing member toward the open end, such that the closing member elastically abuts against the inserting part;   wherein when the inserting part is not inserted into the fixing part, the closing member is biased to the open end by the first elastic member; and when the inserting part is inserted into the fixing part, the closing member is pushed to the receiving end by the inserting part and leaves the open end.   
     
     
         2 . The joint structure according to  claim 1 , wherein:
 a stopper is provided on an inner side of the fixing part side wall, and is positioned between the open end and the receiving end and protrudes inwardly from the inner side of the fixing part side wall; and   a protruding part is provided on an outer side of the inserting part side wall, and protrudes outwardly from the outer side of the inserting part side wall;   when the inserting part is inserted into the fixing part, the protruding part travels over the stopper and abuts against the stopper from a side adjacent to the receiving end, to prevent disengagement of the inserting part from the fixing part.   
     
     
         3 . The joint structure according to  claim 2 , wherein:
 the stopper is formed in a circle along an inner circumference of the fixing part side wall, or is symmetrically provided on the inner circumference of the fixing part side wall in a discrete manner.   
     
     
         4 . The joint structure according to  claim 2 , wherein:
 the closing member is provided with a barb that extends from the closing plate toward the receiving end and has a hook portion protruding toward the fixing part side wall at a bottom end; and   the barb is configured to abut against the stopper from the side adjacent to the receiving end to prevent the disengagement of the closing member from the fixing part when the closing member is biased to the open end by the first elastic member.   
     
     
         5 . The joint structure according to  claim 3 , wherein:
 a cross section of the fixing part side wall is substantially presented as a rectangle, and the stopper is provided on each of long sides and short sides of the rectangle; and   a plurality of protruding parts is provided on the inserting part side wall, and respectively correspond to the stoppers on the long sides and/or the short sides of the fixing part side wall; and the closing member has a plurality of barbs that are configured to correspond to the stoppers on the long sides and/or the short sides of the fixing part side wall.   
     
     
         6 . The joint structure according to  claim 2 , wherein:
 the protruding part extends on the inserting part side wall in a direction perpendicular to the insertion direction, and a slot parallel to the insertion direction is provided on the inserting part side wall at either end of the protruding part.   
     
     
         7 . The joint structure according to  claim 1 , wherein:
 the joint structure further comprises a release button which is provided on the inserting part side wall and partially inserted in the inserting part; the release button is slidable between a locked position away from the inserting part and a release position close to the inserting part in a direction perpendicular to the insertion direction of the inserting part, so as to selectively lock the inserting part to the fixing part.   
     
     
         8 . The joint structure according to claim  9 , wherein:
 the release button comprises:   a pushing portion protruding outwardly at a side away from the fixing part and perpendicular to the insertion direction of the inserting part; and   a locking portion protruding outwardly at a side away from the fixing part part and perpendicular to the insertion direction of the inserting part, and is closer to the fixing part than the pushing portion;   when the inserting part is inserted into the fixing part, the pushing portion remains outside the fixing part, and the locking portion is inserted into the fixing part and is snapped on an inner side of the stopper of the fixing part.   
     
     
         9 . The joint structure according to  claim 1 , wherein:
 the fixing part further has a fixing part edge that extends outwardly from an edge of the open end of the fixing part side wall;   when the inserting part is not inserted into the fixing part, a closing plate of the closing member is substantially flush with the fixing part edge.   
     
     
         10 . The joint structure according to  claim 1 , wherein:
 in the insertion direction of the inserting part, a sum of lengths of the inserting part and the closing member is approximately equal to a length of the fixing part, such that the closing member abuts against the receiving end of the fixing part when the inserting part is inserted into the fixing part.   
     
     
         11 . A child safety seat, comprising:
 a seat body;   a canopy configured to join to an upper part of the seat body;   the joint structure according to  claim 1 , wherein the first object is the seat body and the second object is the canopy; and   the two joint structures are respectively provided on both sides of the seat body, and the receiving end of the fixing part is embedded into the seat body from a corresponding side surface of the seat body, and the open end of the fixing part is exposed out of a corresponding side surface of the seat body.   
     
     
         12 . The child safety seat according to  claim 11 , wherein:
 the canopy comprises a first canopy rod and a second canopy rod that are substantially U-shaped, the joint structure comprises a first canopy rod fixing member and a second canopy rod fixing member, wherein the first canopy rod fixing member is fixed on the inserting part, and the second canopy rod fixing member is pivotally connected to the first canopy rod fixing member; and   two ends of the first canopy rod are fixedly connected to the corresponding first canopy rod fixing members of the two joint structures, respectively; and two ends of the second canopy rod are fixedly connected to the corresponding second canopy rod fixing members of the two joint structures, respectively, so that the second canopy rod is rotatable about an axis parallel to the insertion direction of the inserting part with respect to the first canopy rod.   
     
     
         13 . The joint structure according to  claim 3 , wherein:
 the closing member is provided with a barb that extends from the closing plate toward the receiving end and has a hook portion protruding toward the fixing part side wall at a bottom end; and   the barb is configured to abut against the stopper from the side adjacent to the receiving end to prevent the disengagement of the closing member from the fixing part when the closing member is biased to the open end by the first elastic member.   
     
     
         14 . The joint structure according to  claim 3 , wherein:
 the protruding part extends on the inserting part side wall in a direction perpendicular to the insertion direction, and a slot parallel to the insertion direction is provided on the inserting part side wall at either end of the protruding part.   
     
     
         15 . The joint structure according to  claim 2 , wherein:
 in the insertion direction of the inserting part, a sum of lengths of the inserting part and the closing member is approximately equal to a length of the fixing part, such that the closing member abuts against the receiving end of the fixing part when the inserting part is inserted into the fixing part.   
     
     
         16 . The joint structure according to  claim 9 , wherein:
 in the insertion direction of the inserting part, a sum of lengths of the inserting part and the closing member is approximately equal to a length of the fixing part, such that the closing member abuts against the receiving end of the fixing part when the inserting part is inserted into the fixing part.   
     
     
         17 . The child safety seat according to  claim 15 , wherein:
 a stopper is provided on an inner side of the fixing part side wall, and is positioned between the open end and the receiving end and protrudes inwardly from the inner side of the fixing part side wall; and   a protruding part is provided on an outer side of the inserting part side wall, and protrudes outwardly from the outer side of the inserting part side wall;   when the inserting part is inserted into the fixing part, the protruding part travels over the stopper and abuts against the stopper from a side adjacent to the receiving end, to prevent disengagement of the inserting part from the fixing part.   
     
     
         18 . The child safety seat according to  claim 15 , wherein:
 the joint structure further comprises a release button which is provided on the inserting part side wall and partially inserted in the inserting part; the release button is slidable between a locked position away from the inserting part and a release position close to the inserting part in a direction perpendicular to the insertion direction of the inserting part, so as to selectively lock the inserting part to the fixing part.   
     
     
         19 . The child safety seat according to  claim 15 , wherein:
 the fixing part further has a fixing part edge that extends outwardly from an edge of the open end of the fixing part side wall;   when the inserting part is not inserted into the fixing part, a closing plate of the closing member is substantially flush with the fixing part edge.   
     
     
         20 . The child safety seat according to  claim 15 , wherein:
 in the insertion direction of the inserting part, a sum of lengths of the inserting part and the closing member is approximately equal to a length of the fixing part, such that the closing member abuts against the receiving end of the fixing part when the inserting part is inserted into the fixing part.